A fake version of Teva Pharmaceutical's Adderall, a drug for children and teenagers with chronic sleepiness and attention-deficit hyperactivity disorder, is for sale on rogue websites, the Food and Drug Administration (FDA) warned Tuesday. The counterfeits, which mimic 30-milligram pills that have been in short supply, could pose a health risk to patients because they are made from ingredients used in pain medicines, but the FDA has not received any reports of harm, an agency spokeswoman said. And because they lack the active ingredient, the fakes will not provide the appropriate treatment, she said.